100780819 has 2 divisors, whose sum is σ = 100780820. Its totient is φ = 100780818.

The previous prime is 100780793. The next prime is 100780837. The reversal of 100780819 is 918087001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 100780819 - 2⁵ = 100780787 is a prime.

It is a super-2 number, since 2×100780819² = 20313546956621522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (100780019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50390409 + 50390410.

It is an arithmetic number, because the mean of its divisors is an integer number (50390410).

Almost surely, 2^100780819 is an apocalyptic number.

100780819 is a deficient number, since it is larger than the sum of its proper divisors (1).

100780819 is an equidigital number, since it uses as much as digits as its factorization.

100780819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 34.

The square root of 100780819 is about 10038.9650362973. The cubic root of 100780819 is about 465.3638328741.

The spelling of 100780819 in words is "one hundred million, seven hundred eighty thousand, eight hundred nineteen".